Experimental and numerical investigation of Mg alloy sheet formability

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:586

Article

Mekonen, M. Nebebe¹  Steglich, D.¹  Bohlen, J.²  Stutz, L.²  Letzig, D.²  Mosler, J.^1,3 

[1] Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany

[2] Helmholtz Zentrum Geesthacht, Magnesium Innovat Ctr MagIC, Inst Mat Res, D-21502 Geesthacht, Germany

[3] TU Dortmund, Inst Mech, D-44227 Dortmund, Germany

关键词: Magnesium alloys;    Sheet forming;    Finite element simulation;    Plastic anisotropy;    Localization criterion;   

DOI  :  10.1016/j.msea.2013.07.088

来源: Elsevier

【 摘 要 】

The current paper explores experimentally and numerically obtained mechanical responses of the Nakazima-type sheet forming for the magnesium alloys ZE10 and AZ31 at elevated temperature (200 degrees C). The results from the experiments revealed sufficient ductility allowing sheet forming processes at the prescribed test temperature. The material's anisotropy recorded in previous experiments was confirmed. Differences in the mechanical response between the two materials in terms of strain paths during the forming experiments were quantified. The corresponding numerical responses were obtained employing a suitable constitutive model taking into account the characteristic anisotropy in deformation. In addition, for predicting limit conditions of the forming process, the localization criterion by Marciniak and Kuczynski was adopted. The constitutive model together with the localization criterion was implemented in a finite element framework based on a fully implicit time integration scheme. The reasonably good agreement between the responses of the model and the respective experiments indicated the predictive capabilities of the implemented model for the considered magnesium alloys. (C) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

Free